Order & Family: Floating unicells or a colony embedded in a matrix; no differentiation of apical and base structures; only one family. Genus: A colony of spherical cells; each cell is not covered with a sheath, instead cells are scattered within a gelatinous matrix; the distance between cells is usually longer than their diameter (Illustrations of The Japanese Fresh-water Algae, 1977).

31 μm 63 μm 94 μm; x 640

Images of collecting locality: Yakebe-ike (pond), Sayama park, Higashi-Murayama city, Tokyo, Japan, February 11, 2006 by Y. Tsukii